Resources / Underfloor heating
Underfloor Heating vs Radiators
A practical comparison for Devon and Cornwall homes — comfort, cost, heat pumps, renovations and when each option (or both) makes sense.
Quick Answer
Underfloor heating usually wins on even comfort and heat-pump-friendly low flow temperatures. Radiators usually win on capital cost, install speed and minimal floor disruption.
New floors or major renovations often favour UFH. A straightforward heat-pump retrofit often favours upgraded radiators. Many South West homes use both — underfloor downstairs, radiators up.
View printable checklist Planning aid — not a quote
Side-by-side comparison
| Factor | Underfloor heating | Radiators |
|---|---|---|
| Comfort | Even radiant heat, warm floors | More localised; cooler floors |
| Flow temperature | Typically 35–45°C when designed well | Needs enough surface area to run low; small rads force higher flow |
| Response | Slower (especially screed); steady once warm | Faster to feel heat |
| Disruption | Floor works — height, programme, finishes | Usually wall-mounted swap / upgrade |
| Furniture / layout | Clear walls; rugs can reduce output | Uses wall space; visible |
| Heat pump fit | Excellent when output matches heat loss | Good when correctly sized at design flow temp |
| Typical project fit | New floors, renovations, extensions | Boiler-to-heat-pump with limited floor works |
When underfloor heating is usually better
- •New build, extension or floors already open
- •Major renovation where height and programme allow
- •You want low flow temperatures for a heat pump
- •Even comfort and clear walls matter more than install speed
- •Ground-floor living spaces in a hybrid house
System choice within UFH: overlay vs screed · systems explained · UFH for renovations.
When radiators are usually more practical
- •Budget and disruption must stay tight
- •Floor levels, thresholds or structure make UFH difficult
- •Rooms used intermittently where faster response helps
- •Existing radiators are already large enough (or only a few need upsizing)
- •Upper floors where joist work is undesirable
Radiators are not second-rate with a heat pump. Correctly sized ones work well. The gap is comfort feel and how low you can run flow temperature. Do I need to upgrade my radiators?
With a heat pump, the difference matters more
Heat pumps prefer lower water temperatures. Underfloor heating is designed for that range. Radiators can work in it only with enough surface area at the design flow temperature.
Keep small high-temperature radiators and force the heat pump hotter, and efficiency drops. Emitter choice is part of heat-pump design — not an afterthought.
Flow temperature & efficiency · Heat pump + UFH worth it? · What size heat pump.
The hybrid approach (common in the South West)
Many renovations use underfloor heating on the ground floor and radiators upstairs. That is often the most practical pattern in older Devon and Cornwall homes:
- •Solid ground floor → overlay or screed UFH
- •Joisted first floor → radiators, or UFH plates/boards if the project allows
- •One heat source, coherent controls, honest heat loss for every room
Cost in broad terms
Underfloor heating usually costs more than swapping or upsizing radiators because of floor works, manifolds and finishes. Radiator upgrades for a heat pump are still real money if many emitters change — but the building programme is different.
Planning bands: UFH costs 2026 · heat pump costs 2026. Use the UFH calculator or heat pump estimator for a project-shaped view.
How to decide
- Are floors open or can they be opened within budget?
- Is finished height at doors acceptable for UFH?
- Is the heat source a heat pump aiming for low flow temperature?
- Which rooms need even comfort vs fast response?
- Can a hybrid (UFH down, radiators up) solve more than an either/or?
- Commission heat loss and emitter output at the design flow temperature either way
Honest bottom line
UFH is not automatically superior and radiators are not obsolete. UFH wins when floors and programme allow low-temperature comfort. Radiators win when disruption and capital must stay down — provided they are sized for the flow temperature you will run.
With a heat pump, the real question is emitter capacity at low flow, not brand loyalty to floors or wall panels.
Frequently asked questions
Can I keep radiators with a heat pump?
Yes, if they deliver the room heat loss at the design flow temperature. Many need upsizing. Some rooms may be fine as they are.
Is underfloor heating always more efficient?
It supports lower flow temperatures, which helps heat-pump efficiency. Poorly designed UFH or high flow on tiny radiators both waste that advantage.
Will UFH heat the house as fast as radiators?
Usually no — especially screed. Steady operation is the point. See not warming up fast enough.
Is hybrid more complicated to control?
It needs proper zoning and commissioning, not mystery. One plant, two emitter types is normal when designed as one system.
Next step
Get a realistic planning band for your home, then use the checklist when you speak to installers.